1. Grc Performance

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Mission Viejo, CA

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Grc Performance

4.1 (53 reviews)
Open • 10:00 am - 6:00 pm

Services - Grc Performance

Auto battery or electrical system repair

Auto engine repair

Auto light repair

Grc Performance Photos

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Recommended Reviews - Grc Performance

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Reviews With Photos

Jeffrey M.

I took a 2019 Toyota Tacoma Off-Road to have a 2" leveling spacer put on in the front and a 1" block in the back. After doing some research on the task on Tacoma World Forum, I had a good idea how much labor was involved. Umberto quoted me a very fair price over the phone. It was considerably less than Allen Tire Co. which is a few doors down. The company I work for is down the street from Allen Tire and we do a lot of business with them with our trucks, and they still were very unreasonable. Smh. Thanks Umberto for doing a great job. The staff is really nice as well. I'll be a future customer. Thanks GRC! Jeff

Built by Umberto at GRC. Highly recommend him for builds, and regular service for your daily drivers.
Lloyd S.

Umberto built my 66 Mustang about 5 years ago. We swapped out the stock 200 and added at 302, T5Z, 9" rear, and upgraded suspension and converted to 5 lugs. I don't let ANYONE else touch her. Unfortunately last year I had a rear seal leak and I was too far away to tow. I had to have someone else repair and it's been a nightmare for the past year. This week I brought her back because the leaking started again amd vibrations were getting worse. Umberto got it back to the way it should have been.....and it took less than half a day! I also take my daily drivers to him..... Best prices and repairs and service I know will be done right!

Matt P.

When I came to GRC my '68 mustang was so rusted it wasn't safe to drive. I had 3 shops give me a recommendation and Umberto was by far the most honest and accurate of them. From major fabrication to building an engine from scratch, everything was done by a man that treats cars like artwork. I didn't tell him, but I had a highly recommended shop inspect the car when it was finished and they said they couldn't match the craftsmanship! Not sure what more you could ask for?

Engine
Danielle W.

Took my mustang to 2 other shops for them to finish up the engine build and one shop took 5 months and the other shop took 6 months, barely did any work and charged me $1,200 (5150Racing). Took the half finished engine to GRC and they got it finished up, and put in the car and running within a week, let alone the transmission rebuild and brand new clutch. Thanks guys

SS Camaro Supercharged

GRC Performance is the place if you want to Supercharge your car. I have a 2016 SS Camaro and I wanted to install a supercharger but I wasn't sure of which one to buy. With Sylvia's & Umberto's expertise they helped me decide which way to go. I left my girlfriend (the SS) at their shop & went home to my wife. Sylvia called me a few days later & said my car was ready. I'm blown away by the increase in horsepower. At half acceleration the SS is scary fast, at full power it's pee your pants fast. I went from a muscle car to a super car in a couple of days. In all my years of dealing with speed shops GRC is by far the best. Umberto really knows about high performance cars. He is absolutely the best! The install looks like a factory install. As Sylvia promised my car was done on time & at the price quoted. I trust both of them so much that all my mechanical work on my cars will only be done at GRC Performance. Thank you Umberto & Sylvia!

Kenne Bell on my 06 mustang

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12 years ago

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Umberto G.

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Review Highlights - Grc Performance

“Silvia is also an absolute joy to work with, and her husband, the mechanic and owner, does a stellar job!”

Mentioned in 3 reviews

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O'Reilly Auto Parts

O'Reilly Auto Parts

(44 reviews)

I am the manager for an auto repair shop in Lake Forest, and occasionally use this location…read more Particularly, I want to mention Kenia in the parts or wholesale counter. Working in automotive service for a long time now, you get to learn that knowing about cars is not exclusive to male or female these days, but for many working in the business, you often encounter that the employees are just working - they don't know anything or take an passion or interest in cars and how they work. So I have dealt with both males and females who just don't know anything, and it's rather disappointing. Everyday customer are relying on their expertise. Kennia is amazing. She is thorough, detailed, and goes out of her way to help and find other solutions, proactive, when me, a little shop - is in need of something. She is very knowledgeable. It doesn't take a lot for someone to take the extra step - and it shows. She doesn't have to, but she does anyway. Too many times, these days, we all become satisfied with doing the bare minimum, and don't think about the business or where our heart is it with doing the right thing and the best job we can. I pray she receives the recognition she deserves, because she makes it a pleasure to work with - you can trust what she does and recommends. Great job!

Stopped in as I needed a few items to finish a project on my 4x4. I found the parts and checked out…read morewith Enrique. What a terrific person and excellent customer service. He actually has a personality and has a discussion while checking out. I compliment his excellent customer service skills and must note that it's people like Enrique who make the world a better place. Highly recommended

Kragen Auto Parts

Kragen Auto Parts

(3 reviews)

I never thought I would be reviewing an auto parts, but here I am doing exactly that. I was in the…read moreshopping center across the street from Kragen when my battery decided to take a crap, luckily there was a friendly older gentleman who saw my misery and jump started my car. I immediately drove across the street to have my battery checked...yep no good. I purchased my battery (reasonable price) and the young man helping me at Kragen asked if I needed help changing the batteries out...um ya, I didn't think they even did that for you. Things were starting to look up, I was so glad I didn't need to go any further to complete this task. Well turns out my car isn't that easy to pull the battery out of but he remained friendly and patient and helped me get the battery replaced. No kidding he spent about a good half hour on my car and honestly he really didn't have to so I was greatly appreciative of his efforts and made sure to tip him for his time.

When it comes to car parts its hard to tell what's more important; selection or customer service…read more Ideally one would prefer to have both. With most of the smaller auto parts stores like this one you go there because it is the closest one to your place. I go to this Kragen because it is close. For the most basic needs you'll be ok. Outside of that you might have better luck winning the lottery than you would getting knowledgeable help. It's not even that the people that work there don't know anything about cars, its that they know just enough to look up a part and tell you the price. However I don't go in to places like this expecting a lot. This is more of a "you wont be surprised" review than anything else. My only beef with this place aside from being entirely underwhelming is that most of the staff can't seem to be bothered when you need help. Come in Lo-riding your expectations and possibly leave listening to "You cant always get what you want" by the Rolling Stones, because, really, you can't always get what you want but if you drive here sometime you might, get what you need.

Grc Performance - autopartssupplies - Updated October 2026

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